TY JOUR TI PROBLEMS OF DETERMINING THE PERMISSIBLE LIMITS OF RESTRICTIONS ON FREEDOM OF SPEECH AND ASSEMBLY IN EMERGENCY SITUATIONS (CONSTITUTIONAL AND LEGAL ANALYSIS) KW public events concept KW picket KW rally KW online rally KW freedom of peaceful assembly KW special legal regime KW emergencies KW national security KW participant and organizer of public event KW constitutional control JO LAW. SAFETY. EMERGENCY SITUATIONS AU Grishchenko, T.A. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia